Various embodiments of a novel attachable garment collar cover are disclosed. In one embodiment, the attachable garment collar cover has a first collar cover blade, a second collar cover blade, a first button hole edge, a second button hole edge, a rear elastic, and a collar insert opening that can form an arched groove. A collar portion of a shirt, a dress, a coat, a blouse, or another article of clothing can be inserted into the collar insert opening of the attachable garment collar cover, and be fastened by the rear elastic of the attachable garment collar cover. The attachable garment collar cover completely encapsulates the collar portion of the article of clothing to protect and/or hide the collar from stains and wear-and-tear. When attached to the collar portion of the article of clothing, the attachable garment collar cover can also provide a pleasant and unique fashion statement.